Margaret Thatcher, inventor of soft-serve ice cream?

TheAtlantic.com is reporting that Margaret Thatcher may have helped invent soft-serve ice cream:

Margaret Thatcher died this morning at the age of 87. While some of her achievements over her long career have been and remain controversial, there is one accomplishment that has proven purely and Platonically beneficial — to Britons, to Americans, to lovers of dairy the world over. Margaret Thatcher, the legend goes, helped invent soft-serve ice cream.